new addNode methods added
MetadataDocumentTest moved and improved
addNode simplified
various MetadataDocumentTest improvements

operators in asserts removed
indexOf -> contains
assertTrue -> assertEquals
getString operations on xml document inlined
NotFound exception expected
MetadataDocument ported to new addNode method
gmd:onLine before gml:offLine
MetadataDocument fixes
choose prefix based on document context
Merge pull request #163 from IDgis/metadata-improvements

Metadata improvements